Secondary Battery Wrapping Tape Adhesive Segmentation
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Solution Overview
Problem
Secondary batteries face challenges in maintaining the wound state of electrode assemblies due to expansive forces, leading to internal deformation and reduced battery life, which complicates thickness control and longevity.
Innovation Solution
The use of wrapping tape with adhesive layers coated on specific areas of its surface, parallel to the winding axis, to surround the electrode assembly, providing a flexible adhesive force that controls expansion forces and prevents internal deformation, while being resistant to electrolytes and maintaining the assembly's wound state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If wrapping tape with adhesive layers is used to surround the electrode assembly, then the electrode assembly maintains its wound state and internal deformation is reduced, but the adhesive layers occupy additional area on the wrapping tape
Solution Approach 1:
The wrapping tape has different functional areas: adhesive layers are applied only on specific portions (first and second portions) while other portions remain non-adhesive. This local differentiation allows the tape to provide adhesion where needed while minimizing total adhesive material and maintaining flexibility in other areas, thus resolving the contradiction between stability and area occupation.
2Force
If adhesive layers are coated on parts of the wrapping tape surface, then expansion forces are controlled and internal deformation is prevented, but the adhesive force distribution becomes more complex
Solution Approach 1:
The adhesive layers are segmented into distinct first and second portions positioned at different locations on the wrapping tape. This segmentation allows independent control of adhesive forces at different locations, enabling precise control of expansion forces while simplifying the overall adhesive force distribution pattern compared to a uniform adhesive coating.
3Reliability
If the wrapping tape is made resistant to electrolytes, then the battery durability is improved, but the material selection and processing become more restricted
Solution Approach 1:
The wrapping tape is constructed as a composite material system combining a base polymer material with electrolyte-resistant adhesive layers. This composite structure provides both the mechanical flexibility needed for wrapping and the chemical resistance to electrolytes, thereby improving durability while maintaining ease of manufacture through the use of compatible material combinations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the durability and stability of secondary batteries by controlling expansion forces, reducing internal deformation, and extending battery life through controlled thickness and improved structural integrity.
Implementation Method 1
wrapping tape including a first surface and a second surface opposite to the first surface, the wrapping tape surrounding the electrode assembly, and having adhesive layers coated only on parts of the first surface
Data Source
AI summary
A secondary battery includes an electrode assembly including a first electrode plate, a second electrode plate, and a separator provided between the first and second electrode plates, wrapping tape including a first surface and a second surface opposite to the first surface, the wrapping tape surrounding the electrode assembly, and having adhesive layers coated only on parts of the first surface, a can including an opening at a side thereof to insert the electrode assembly therethrough, the can accommodating the electrode assembly therein, and a cap assembly configured to close the opening of the can.